I was checking the fluid levels etc in prep for MAR. Found the threads on my radiator fill plug to be deteriorating. I had another plastic plug but it did not match. My current plug is what seems to be fine thread. All I can find are the more "course thread" brass and plastic replacement plugs. post 1989.

Assuming this one is stock, its from a 3.5 V8. but now has a 3.9 (94 NAS) engine.

Question.. Was there a different one for earlier v8?

Pic installed, radiator is hot now so cant pull it yet for pic of threads.